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Share-based compensation - PSU activity (Details) - 2014 Plan	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Other disclosure
Vesting period (in years)	4 years
Performance share units ("PSUs")
Number of shares
Non-vested at beginning of period (in shares) | shares	212,614
Granted (in shares) | shares	66,600
Vested (in shares) | shares	(132,368)
Forfeited (in shares) | shares	(2,916)
Non-vested at end of period (in shares) | shares	143,930
Weighted average grant-date fair value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 42.32
Granted (in dollars per share) | $ / shares	36.39
Vested (in dollars per share) | $ / shares	33.09
Forfeited (in dollars per share) | $ / shares	57.56
Non-vested at end of period (in dollars per share) | $ / shares	$ 47.76

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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